RU730028C - Electropulse drilling end piece - Google Patents

Description

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FIELD: mining. SUBSTANCE: invention relates to mining industry, namely, to tips of electric impact drill bits, and may find application in well drilling.

An electropulse drill bit is known, consisting of electrode systems separated by insulation and a protective cap.

The disadvantage of this well-known tip is that the pallet-lifting operations (especially during descents) the tip strikes the unevenness of the walls of the borehole. intervals (lowering the speed of the wellbore) .On the other hand, the possibility of increasing the mechanical strength of the electrodes is limited.

Sometimes the impact of the tip is also damaged by impacts on the borehole walls.

The aim of the invention is to protect the drill bit from damage.

The goal is achieved. that between the grounded electrodes and the protective jacket are installed with the possibility of longitudinal movement ynoptt.

Fig. T shows an electropulse drill bit, general view; figure 2 - its cross section aa in fig. 1; in Fig. 3 section BB in Fig. 1.

The grounded 1 and high voltage 2 electrode systems are separated by an insulator 3 with longitudinal channels 4 for supplying a bore of a washing agent to the face. The rotation of the electrode systems relative to each other is prevented by making the sleeve of the insulator 5 and the rod of the oval shape and due to the installation of the segments 7. Drop-out of the high-voltage electric system

ELECTRIC PULSE DRILLING TIP, consisting of electrode Q systems, separated by insulation and a protective cap, characterized in that. what with

nut 8. The impulses of high voltage are supplied by ho to the conductor 9. Outside ground 1 and high voltage 2 electrode systems

closed with a protective jacket (casing) 10, provided in the bottom (bottomhole) part of the stops 11. In the grounded electrodes 1 under the stops 11 made longitudinal channels. Over protective jacket 10 installed

spring 12. which protrusion 13 prevents its upward movement.

When the drill bit is lowered into the well (more precisely, after its assembly), the parts are in the position shown on

figure 1. The protective jacket 10 is lowered by weight and spring 12 and protects the electrodes 1 and 2 from impacts on the borehole walls. Stops 11 protrude from the drill bit. They are slightly bent inwards,

so as not to touch the ends of the walls of the well.

The brown tip works as follows. When installing the tip on the bottom of the well, the stops 11 are sunk

a protective jacket 10 is pulled up into the longitudinal channels of the electrodes 1, which compresses the spring 12. It is necessary to provide for the jacket 10 to be raised to a height A above the end of the drill bit

(bottom of the well) so that electrical discharges do not develop on it from the high-voltage electrodes 2, i.e. the gap between the protective sleeve 10 and the high voltage electrodes 2 should exceed the value of the interelectrode distance.

The considered constructional protection of the drill bit can be applied not only in electric impulse drill bits with a direct flushing agent circulation circuit, but also with reverse circulation, as well as in drill bits for other methods of drilling holes where there is a need for their protection against impacts .

In order to protect the drill bit from damage, stops are mounted between the grounded electrodes and the protective jacket.

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